CN103607105A - Dead zone compensation control method and system thereof - Google Patents

Abstract

The invention discloses a dead zone compensation control method and a system thereof. The dead zone compensation control method comprises the following steps of acquiring a first duty ratio of a modulating wave according to a current voltage instruction, a carrier wave period and a current direct current bus voltage; carrying out compensation of a compensation value on the first duty ratio so that a second duty ratio is acquired, wherein the compensation value is decided by a current instruction; the current instruction corresponds to the current voltage instruction; receiving the second duty ratio and controlling opening and closing of a bridge arm according to the second duty ratio.

Description

A kind of dead area compensation control method and system

Technical field

The present invention relates to a kind of electronic technology field, relate in particular to a kind of dead area compensation control method and system.

Background technology

Every in frequency-variable controller hardware circuit in three-phase U, V, W include mutually two upper and lower complementary brachium pontis (be IGBT, Insulated Gate Bipolar Transistor, Chinese full name: insulated gate bipolar transistor).The compound full-control type voltage driven type power semiconductor that each brachium pontis is comprised of BJT (double pole triode) and MOS (insulating gate type field effect tube), upper and lower two brachium pontis are turn-on and turn-off in turn strictly.

But actual conditions are, the switching of each device needs the regular hour, and especially the turn-off time is longer than ON time.In turn off process, if the device conducting immediately of cut-off must cause bridgc arm short.In order to prevent this from occurring, must in driving signal, introduce one section of Dead Time Td.The conducting simultaneously of upper and lower two brachium pontis, needs real-time therein insertion dead band, guarantees that upper and lower two brachium pontis can not cause short circuit, guarantees the safety of brachium pontis.

The introducing of Dead Time makes main circuit can not accurately reproduce the ideal Modulated waveform being produced by modulation wave generator, the voltage and current of impact output, and there is serious distortion in the voltage while making low speed underloading and electric current, causes torque pulsation and harmonic wave.

Current dead-zone compensation method, or realize by hardware circuit, or coordinate complicated software to realize by complicated model, compensate inaccurate, cause certain " dead time effect ", cause the distortion of compressor phase current, cause the power pollution to power supply and other electrical equipment, to a certain degree reduced the power factor (PF) of compressor and the performance of system, particularly caused that low frequency axis error estimates the problems such as inaccurate.

Summary of the invention

The application provides a kind of dead area compensation control method and system, solved in prior art, because of dead area compensation inaccurate, cause causing the distortion of compressor phase current, cause the technical problem to the power pollution of power supply and other electrical equipment, reach the accuracy that improves dead area compensation, reduced the distortion of electric current, reduced the technique effect to the power pollution of power supply and other electrical equipment.

The application provides a kind of dead area compensation control method, and described dead area compensation control method comprises:

According to current voltage instruction, carrier cycle and current DC bus-bar voltage, obtain the first dutyfactor value of modulating wave;

Compensation to described first dutyfactor value value of compensating, obtains the second dutyfactor value, and the size of described offset determines by current current-order, and described current current-order is corresponding with described current voltage instruction;

Receive described the second dutyfactor value, according to described the second dutyfactor value, control the folding of brachium pontis.

Preferably, described according to current voltage instruction, carrier cycle and current DC bus-bar voltage, the first dutyfactor value of acquisition modulating wave, is specially:

According to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, obtain three-phase modulations ripple at the first duty ratio T of carrier cycle _u, T _vand T _w.

Preferably, current current-order is vector

projection in the reference axis of three-phase U, V, W is respectively I _u ^*, I _v ^*, I _w ^*time, the size of described offset is determined by current current-order, is specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*the Dead Time T of positive and negative and modulating wave _dsize is relevant.

Preferably, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

Work as I _u ^*>=0 o'clock,

i _u ^*during < 0,

work as I _v ^*>=0 o'clock,

i _v ^*during < 0, $\mathrm{\&Delta;}{T}_v=-\frac{T_d}{2};$ Work as I _w ^* _>=0time, $\mathrm{\&Delta;}{T}_w=\frac{T_d}{2},$ I _w ^*during < 0, $\mathrm{\&Delta;}{T}_w=-\frac{T_d}{2}.$

Preferably, the described compensation to described first dutyfactor value value of compensating, obtains the second dutyfactor value, is specially:

By described the first dutyfactor value T _u, T _vand T _wrespectively with described offset Δ T _u, Δ T _vwith Δ T _wsuperpose, obtain described the second dutyfactor value T _u1, T _v1and T _w1.

Preferably, exist

during angle (θ+Φ) with reference axis U between mutually, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize relevant to the size of (θ+Φ) respectively, wherein, θ is rotor and reference axis U angle, θ+Φ is

angle with reference axis U.

A dead area compensation control system, comprising:

Duty ratio control unit, for according to current voltage instruction, carrier cycle and current DC bus-bar voltage, obtains the first dutyfactor value of modulating wave;

Dead area compensation control unit, for the compensation to described first dutyfactor value value of compensating, obtains the second dutyfactor value, and the size of described offset determines by current current-order, and described current current-order is corresponding with described current voltage instruction;

Brachium pontis control unit, for receiving described the second dutyfactor value, controls the folding of brachium pontis according to described the second dutyfactor value.

Preferably, described Duty ratio control unit specifically for:

According to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, obtain three-phase modulations ripple at the first duty ratio T of carrier cycle _u, T _vand T _w.

Preferably, current current-order is vector projection in the reference axis of three-phase U, V, W is respectively I _u ^*, I _v ^*, I _w ^*time, the size of described offset is determined by current current-order, is specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*the Dead Time T of positive and negative and modulating wave _dsize is relevant.

Preferably, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wpositive and negative respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

Work as I _u ^*>=0 o'clock,

i _u ^*during < 0, work as I _v ^*>=0 o'clock, i _v ^*during < 0, $\mathrm{\&Delta;}{T}_v=-\frac{T_d}{2};$ Work as I _w ^*>=0 o'clock, $\mathrm{\&Delta;}{T}_w=\frac{T_d}{2},$ Time, I _w ^*during < 0, $\mathrm{\&Delta;}{T}_w=-\frac{T_d}{2}.$

Preferably, described dead area compensation control unit specifically for:

By described the first dutyfactor value T _u, T _vand T _wrespectively with described offset Δ T _u, Δ T _vwith Δ T _wsuperpose, obtain described the second dutyfactor value T _u1, T _v1and T _w1.

Preferably, exist

during angle (θ+Φ) with reference axis U between mutually, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize relevant to the size of (θ+Φ) respectively, wherein, θ is rotor and reference axis U angle, θ+Φ is

angle with reference axis U.

The application's beneficial effect is as follows:

Above-mentioned dead area compensation control method is by offset corresponding to current current-order, the first dutyfactor value is compensated accurately, according to the second dutyfactor value after compensation, accurately control brachium pontis and folding, guarantee that actual output current is identical with control electric current, while guaranteeing the current zero-crossing point in compressor three-phase, there is not saltus step, avoid current distortion, thereby solved in prior art, because of dead area compensation inaccurate, cause causing the distortion of compressor phase current, cause the technical problem to the power pollution of power supply and other electrical equipment, reach the accuracy that improves dead area compensation, reduced the distortion of electric current, reduced the technique effect to the power pollution of power supply and other electrical equipment.

By offset Δ T _u, Δ T _vwith Δ T _wrespectively the duty ratio of three-phase U, V, the corresponding phase of W is compensated, thereby guarantee that actual output current when every phase current is positive and negative in three-phase U, V, W is identical with control electric current, while guaranteeing the current zero-crossing point in compressor three-phase, there is not saltus step, avoid current distortion.

Accompanying drawing explanation

Fig. 1 is the flow chart of the application's the first preferred embodiments dead area compensation control method;

Fig. 2 is the coordinate schematic diagram of dead area compensation control method in Fig. 1;

Fig. 3 is the block diagram of system corresponding to dead area compensation control method in Fig. 1.

Embodiment

The embodiment of the present application is by providing a kind of dead area compensation control method and system, solved in prior art, because of dead area compensation inaccurate, cause causing the distortion of compressor phase current, cause the technical problem to the power pollution of power supply and other electrical equipment, reach the accuracy that improves dead area compensation, reduced the distortion of electric current, reduced the technique effect to the power pollution of power supply and other electrical equipment.

Technical scheme in the embodiment of the present application is for solving the problems of the technologies described above, and general thought is as follows:

A dead area compensation control method, described dead area compensation control method comprises:

According to current voltage instruction, carrier cycle and current DC bus-bar voltage, obtain the first dutyfactor value of modulating wave;

Compensation to described first dutyfactor value value of compensating, obtains the second dutyfactor value, and the size of described offset determines by current current-order, and described current current-order is corresponding with described current voltage instruction;

Receive described the second dutyfactor value, according to described the second dutyfactor value, control the folding of brachium pontis.

A dead area compensation control system, comprising:

Duty ratio control unit, for according to current voltage instruction, carrier cycle and current DC bus-bar voltage, obtains the first dutyfactor value of modulating wave;

Dead area compensation control unit, for the compensation to described first dutyfactor value value of compensating, obtains the second dutyfactor value, and the size of described offset determines by current current-order, and described current current-order is corresponding with described current voltage instruction;

Brachium pontis control unit, for receiving described the second dutyfactor value, controls the folding of brachium pontis according to described the second dutyfactor value.

Above-mentioned dead area compensation control method is by offset corresponding to current current-order, the first dutyfactor value is compensated accurately, according to the second dutyfactor value after compensation, accurately control brachium pontis and folding, guarantee that actual output current is identical with control electric current, while guaranteeing the current zero-crossing point in compressor three-phase, there is not saltus step, avoid current distortion, thereby solved in prior art, because of dead area compensation inaccurate, cause causing the distortion of compressor phase current, cause the technical problem to the power pollution of power supply and other electrical equipment, reach the accuracy that improves dead area compensation, reduced the distortion of electric current, reduced the technique effect to the power pollution of power supply and other electrical equipment.

In order better to understand technique scheme, below in conjunction with Figure of description and concrete execution mode, technique scheme is described in detail.

As shown in Figure 1, be the flow chart of the application's the first preferred embodiments dead area compensation control method 100.This dead-zone compensation method 100 can be in motor, also can be in inverter, or in the electrical equipment of other AC-DC-interchanges.Dead area compensation control method 100 comprises the following steps:

Step 110, according to current voltage instruction, carrier cycle and current DC bus-bar voltage, obtains the first dutyfactor value of modulating wave.That is to say, the first dutyfactor value of modulating wave is by calculating current voltage instruction, carrier cycle and current DC bus-bar voltage.Current voltage instruction is the V of current input _d ^*and V _q ^*instruction.DC bus-bar voltage Edu is a dynamic value, and DC bus-bar voltage Edu is along with variation and the load of alternating voltage change and change.Carrier cycle Tc is the carrier cycle of modulating wave, the inverse that carrier cycle is carrier frequency.According to current voltage instruction, carrier cycle Tc and current DC bus-bar voltage Edu, after obtaining the first dutyfactor value T of modulating wave, enter step 120.

Step 120, the compensation to the described first dutyfactor value T value of compensating Δ T, obtains the second dutyfactor value T ₁, the size of described offset Δ T determines by current current-order, described current current-order is corresponding with described current voltage instruction.Compensation way can be for drawing the second dutyfactor value by the summation of the first duty ratio value and offset, also the first duty ratio value and offset can be drawn to the second dutyfactor value by certain logical algorithm etc.Current current-order is current V _d ^*and V _q ^*the I that instruction difference is corresponding _d ^*and I _q ^*instruction.

Step 130, receives described the second dutyfactor value, controls the folding of brachium pontis according to described the second dutyfactor value.

Above-mentioned dead area compensation control method is by offset corresponding to current current-order, the first dutyfactor value is compensated accurately, according to the second dutyfactor value after compensation, accurately control brachium pontis and folding, guarantee that actual output current is identical with control electric current, while guaranteeing the current zero-crossing point in compressor three-phase, there is not saltus step, avoid current distortion, thereby solved in prior art, because of dead area compensation inaccurate, cause causing the distortion of compressor phase current, cause the technical problem to the power pollution of power supply and other electrical equipment, reach the accuracy that improves dead area compensation, reduced the distortion of electric current, reduced the technique effect to the power pollution of power supply and other electrical equipment.

Particularly, in U, V, W three-phase alternating current, described according to current voltage instruction, carrier cycle and current DC bus-bar voltage, the first dutyfactor value of acquisition modulating wave, is specially:

According to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, obtain three-phase modulations ripple at the first duty ratio T of carrier cycle _u, T _vand T _w.That is to say according to current voltage instruction, carrier cycle and current DC bus-bar voltage, calculate respectively the duty ratio T of every phase of three-phase U, V, W _u, T _vand T _w.

As shown in Figure 2, three-phase U, V, W are all in ab rectangular coordinate system, and wherein, U axle and a axle are overlapping, U axle and V axle clamp angle 120 degree, and V axle and W axle clamp angle are 120 degree, W axle and U axle clamp angle are 120 degree.Ab coordinate system also has armature spindle d axle and the q axle vertical with armature spindle.Wherein, θ is the angle between d axle and α axle, is also the position angle of rotor,

for the current current order vector of motor, by current order vector I _d ^*, I _q ^*unique definite, I _d ^*and I _q ^*be respectively the order of d shaft current and the order of q shaft current.Φ is

with reference axis d axle be the angle of motor rotor position.

Particularly, current current-order is vector

projection in the reference axis of three-phase U, V, W is respectively I _u ^*, I _v ^*, I _w ^*time, the size of described offset is determined by current current-order, is specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*the Dead Time T of positive and negative and modulating wave _dsize is relevant.

That is to say the duty ratio offset Δ T of every phase of three-phase U, V, W _u, Δ T _vwith Δ T _wwith current phasor projection I in the reference axis of three-phase U, V, W _u ^*, I _v ^*, I _w ^*relevant, as: I worked as _u ^*>=0 o'clock, Δ T _ufor just, I _u ^*during < 0, Δ T _ufor negative; Work as I _v ^*>=0 o'clock, Δ T _vfor just, I _v ^*during < 0, Δ T _vfor just, for negative; Work as I _w ^*>=0 o'clock, Δ T _wfor just, I _wduring < 0, Δ T _wfor negative.

Dead Time T _dsize can determine by chip internal specified register is set, its size can change as required.

Further, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

Work as I _u ^*>=0 o'clock,

i _u ^*during < 0,

work as I _v ^*>=0 o'clock,

i _v ^*during < 0, $\mathrm{\&Delta;}{T}_v=-\frac{T_d}{2};$ Work as I _w ^*>=0 o'clock, $\mathrm{\&Delta;}{T}_w=\frac{T_d}{2},$ I _w ^*during < 0, $\mathrm{\&Delta;}{T}_w=-\frac{T_d}{2}.$

When adopting above-mentioned dead-zone compensation method to control the brachium pontis folding of U phase, work as I _u ^*>=0 o'clock, control waveform increased by one

time, that is, control brachium pontis and delay

time separated, U+ is delayed

time declines, and guarantees that U phase current is that timing actual output current is identical with control electric current; I _u ^*during < 0, control waveform reduces one

time, that is, control brachium pontis in advance time is closed, makes U-in advance

time rises, and guarantees that U phase current is that while bearing, actual output current is identical with control electric current, while guaranteeing the current zero-crossing point during compressor U mutually, saltus step does not occur, and avoids current distortion.

When adopting above-mentioned dead-zone compensation method to control the brachium pontis folding of V phase, work as I _v ^*>=0 o'clock, control waveform increased by one

time, that is, control brachium pontis and delay

time separated, V+ is delayed

time declines, and guarantees that V phase current is that timing actual output current is identical with control electric current; I _v ^*during < 0, control waveform reduces one time, that is, control brachium pontis in advance time is closed, makes before V-

time rises, and guarantees that V phase current is that while bearing, actual output current is identical with control electric current, while guaranteeing the current zero-crossing point during compressor V mutually, saltus step does not occur, and avoids current distortion.

When adopting above-mentioned dead-zone compensation method to control the brachium pontis folding of W phase, work as I _w ^*>=0 o'clock, control waveform increased by one

time, that is, control brachium pontis and delay

time separated, W+ is delayed

time declines, and guarantees that W phase current is that timing actual output current is identical with control electric current; I _w ^*during < 0, control waveform reduces one

time, that is, control brachium pontis in advance

time is closed, makes W-in advance

time rises, and guarantees that W phase current is that while bearing, actual output current is identical with control electric current, while guaranteeing the current zero-crossing point during compressor W mutually, saltus step does not occur, and avoids current distortion.

Further, the described compensation to described first dutyfactor value value of compensating, obtains the second dutyfactor value, is specially:

By described the first dutyfactor value T _u, T _vand T _wrespectively with described offset Δ T _u, Δ T _vwith Δ T _wsuperpose, obtain described the second dutyfactor value T _u1, T _v1and T _w1.That is to say T _u1=T _u+ Δ T _u, T _v1=T _v+ Δ T _v, T _w1=T _w+ Δ T _w.

Particularly, exist

during angle (θ+Φ) with reference axis U between mutually, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize relevant to the size of (θ+Φ) respectively, wherein, θ is rotor a axle and reference axis U angle, θ+Φ is

angle with reference axis U.

In specific implementation process, ${I_u}^{*}=\left|\stackrel{\&RightArrow;}{I^{*}}\right|\cos (\mathrm{\&theta;}+\mathrm{\&Phi;}),$ ${I_v}^{*}=\left|\stackrel{\&RightArrow;}{I^{*}}\right|\cos (\mathrm{\&theta;}+\mathrm{\&Phi;}-120),$ ${I_w}^{*}=\left|\stackrel{\&RightArrow;}{I^{*}}\right|\cos (\mathrm{\&theta;}+\mathrm{\&Phi;}+120),$ Wherein

represent electric current

amplitude, can only according to the residing scope of angle (θ+Φ), determine I _u ^*, I _v ^*, I _w ^*positive and negative; As when 30 ° of 0≤(θ+Φ) <, I _u ^*>=0, I _v ^*< 0, I _w ^*< 0.

Can also determine I by mode once _u ^*, I _v ^*, I _w ^*positive and negative, by I _d ^*, I _q ^*by dq reference axis, to ab change of coordinates, be transformed to I _α ^*, I _β ^*, then by I _α ^*, I _β ^*conversion by ab coordinate to reference axis (U, V, W), is transformed to I _u ^*, I _v ^*, I _w ^*, can determine I thus _u ^*, I _v ^*, I _w ^*positive and negative.

As shown in Figure 3, the dead area compensation control system 200 that above-mentioned district compensating control method is corresponding comprises:

Duty ratio control unit 210, for according to current voltage instruction, carrier cycle and current DC bus-bar voltage, obtains the first dutyfactor value of modulating wave;

Dead area compensation control unit 220, for the compensation to described first dutyfactor value value of compensating, obtains the second dutyfactor value, and the size of described offset determines by current current-order, and described current current-order is corresponding with described current voltage instruction;

Brachium pontis control unit 230, for receiving described the second dutyfactor value, controls the folding of brachium pontis according to described the second dutyfactor value.

Particularly, described Duty ratio control unit 210 specifically for: according to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, obtain three-phase modulations ripple at the first duty ratio T of carrier cycle _u, T _vand T _w.

Particularly, current current-order is vector

projection in the reference axis of three-phase U, V, W is respectively I _u ^*, I _v ^*, I _w ^*time, the size of described offset is determined by current current-order, is specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*the Dead Time T of positive and negative and modulating wave _dsize is relevant.

Particularly, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wpositive and negative respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

Work as I _u ^*>=0 o'clock,

i _u ^*during < 0,

work as I _v ^*>=0 o'clock,

i _v ^*during < 0, $\mathrm{\&Delta;}{T}_v=-\frac{T_d}{2};$ Work as I _w ^*>=0 o'clock, $\mathrm{\&Delta;}{T}_w=\frac{T_d}{2}$ Time, I _w ^*during < 0, $\mathrm{\&Delta;}{T}_w=-\frac{T_d}{2}.$

Particularly, described dead area compensation control unit specifically for:

By described the first dutyfactor value T _u, T _vand T _wrespectively with described offset Δ T _u, Δ T _vwith Δ T _wsuperpose, obtain described the second dutyfactor value T _u1, T _v1and T _w1.

Particularly, exist during angle (θ+Φ) with reference axis U between mutually, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize relevant to the size of (θ+Φ) respectively, wherein, θ is rotor and reference axis U angle, θ+Φ is

angle with reference axis U.

Above-mentioned dead area compensation control method is by offset corresponding to current current-order, the first dutyfactor value is compensated accurately, according to the second dutyfactor value after compensation, accurately control brachium pontis and folding, guarantee that actual output current is identical with control electric current, guarantee compressor U, V, during the current zero-crossing point of W in mutually, there is not saltus step, avoid current distortion, thereby solved in prior art, because of dead area compensation inaccurate, cause causing the distortion of compressor phase current, cause the technical problem to the power pollution of power supply and other electrical equipment, reach the accuracy that improves dead area compensation, reduced the distortion of electric current, reduced the technique effect to the power pollution of power supply and other electrical equipment.

By offset Δ T _u, Δ T _vwith Δ T _wrespectively the duty ratio of three-phase U, V, the corresponding phase of W is compensated, thereby guarantee that actual output current when every phase current is positive and negative in three-phase U, V, W is identical with control electric current, while guaranteeing the current zero-crossing point during compressor U, V, W are mutually, there is not saltus step, avoid current distortion.

Although described the preferred embodiments of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.

Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.

Claims (12)

1. a dead area compensation control method, is characterized in that, described dead area compensation control method comprises:

According to current voltage instruction, carrier cycle and current DC bus-bar voltage, obtain the first dutyfactor value of modulating wave;

Compensation to described first dutyfactor value value of compensating, obtains the second dutyfactor value, and the size of described offset determines by current current-order, and described current current-order is corresponding with described current voltage instruction;

Receive described the second dutyfactor value, according to described the second dutyfactor value, control the folding of brachium pontis.

2. dead area compensation control method as claimed in claim 1, is characterized in that, described according to current voltage instruction, carrier cycle and current DC bus-bar voltage, obtains the first dutyfactor value of modulating wave, is specially:

According to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, obtain three-phase modulations ripple at the first duty ratio T of carrier cycle _u, T _vand T _w.

3. dead area compensation control method as claimed in claim 2, is characterized in that, current current-order is vector projection in the reference axis of three-phase U, V, W is respectively I _u ^*, I _v ^*, I _w ^*time, the size of described offset is determined by current current-order, is specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*the Dead Time T of positive and negative and modulating wave _dsize is relevant.

4. dead area compensation control method as claimed in claim 3, is characterized in that, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

Work as I _u ^*>=0 o'clock,

i _u ^*during < 0,

work as I _v ^*>=0 o'clock,

i _v ^*during < 0, $\mathrm{\&Delta;}{T}_v=-\frac{T_d}{2};$ Work as I _w ^*>=0 o'clock, $\mathrm{\&Delta;}{T}_w=\frac{T_d}{2},$ I _w ^*during < 0, $\mathrm{\&Delta;}{T}_w=-\frac{T_d}{2}.$

5. dead area compensation control method as claimed in claim 4, is characterized in that, the described compensation to described first dutyfactor value value of compensating, obtains the second dutyfactor value, is specially:

By described the first dutyfactor value T _u, T _vand T _wrespectively with described offset Δ T _u, Δ T _vwith Δ T _wsuperpose, obtain described the second dutyfactor value T _u1, T _v1and T _w1.

6. dead area compensation control method as claimed in claim 3, is characterized in that,

during angle (θ+Φ) with reference axis U between mutually, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize relevant to the size of (θ+Φ) respectively, wherein, θ is rotor axis of electric and reference axis U angle, θ+Φ is

angle with reference axis U.

7. a dead area compensation control system, is characterized in that, described dead area compensation control system comprises:

Duty ratio control unit, for according to current voltage instruction, carrier cycle and current DC bus-bar voltage, obtains the first dutyfactor value of modulating wave;

Dead area compensation control unit, for the compensation to described first dutyfactor value value of compensating, obtains the second dutyfactor value, and the size of described offset determines by current current-order, and described current current-order is corresponding with described current voltage instruction;

Brachium pontis control unit, for receiving described the second dutyfactor value, controls the folding of brachium pontis according to described the second dutyfactor value.

8. dead area compensation control system as claimed in claim 7, is characterized in that, described Duty ratio control unit specifically for:

According to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, obtain three-phase modulations ripple at the first duty ratio T of carrier cycle _u, T _vand T _w.

9. dead area compensation control system as claimed in claim 8, is characterized in that, current current-order is vector

projection in the reference axis of three-phase U, V, W is respectively I _u ^*, I _v ^*, I _w ^*time, the size of described offset is determined by current current-order, is specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*the Dead Time T of positive and negative and modulating wave _dsize is relevant.

10. dead area compensation control system as claimed in claim 9, is characterized in that, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wpositive and negative respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

Work as I _u ^*>=0 o'clock,

i _u ^*during < 0,

work as I _v ^*>=0 o'clock,

i _v ^*during < 0, $\mathrm{\&Delta;}{T}_v=-\frac{T_d}{2};$ Work as I _w ^*>=0 o'clock, $\mathrm{\&Delta;}{T}_w=\frac{T_d}{2}$ Time, I _w ^*during < 0, $\mathrm{\&Delta;}{T}_w=-\frac{T_d}{2}.$

11. dead area compensation control system as claimed in claim 10, is characterized in that, described dead area compensation control unit specifically for:

By described the first dutyfactor value T _u, T _vand T _wrespectively with described offset Δ T _u, Δ T _vwith Δ T _wsuperpose, obtain described the second dutyfactor value T _u1, T _v1and T _w1.

12. dead area compensation control system as claimed in claim 9, is characterized in that,

during angle (θ+Φ) with reference axis U between mutually, the offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize respectively with I _u ^*, I _v ^*, I _w ^*positive and negative dependence, be specially:

The offset Δ T that described three-phase modulations ripple is corresponding _u, Δ T _vwith Δ T _wsize relevant to the size of (θ+Φ) respectively, wherein, θ is rotor and reference axis U angle, θ+Φ is

angle with reference axis U.

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